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v3.20.1

Accounts receivable, net (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Accounts receivable, net |  |  |
Trade accounts receivable | $ 23,138,736 | $ 22,331,720 |
Receivable from OC-BVI | 10,808 | 46,600 |
Other accounts receivable | 222,381 | 242,799 |
Accounts Receivable, Gross, Current | 23,371,925 | 22,621,119 |
Allowance for doubtful accounts | (142,236) | (158,902) | $ (158,902)
Accounts receivable, net | $ 23,229,689 | $ 22,462,217 |

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